Stress_path_data
Contents
Data Structure: Stress_path_data |
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Description |
Defines data for cell stress path analysis |
Usage |
Stress_path_data NUM=ival where ival is the data structure number |
Description |
Overview The Stress_path_data structure allows a single element analysis to be performed which is representative of the burial history of a point of sediment. The stress and temperature boundary conditions for the model are automatically calculated based on the input burial history, the material properties required to calculate the overburden (such as matrix density, fluid density and porosity) and the thermal gradient. The burial history is defined via the Sedimentation_rate keyword, which may define a constant sedimentation rate or an evolving sedimentation rate by assigning a time curve via Sedimentation_time_curve or Sedimentation_time_curve_name .
•It is possible to simulate erosion by defining a negative sedimentation rate. •The computed depth which is used to calculate the temperature boundary condition during the analysis takes into account sediment compaction.
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 | Sedimentation_rate Sedimentation rate |
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Defines a constant sedimentation rate. In order to define an evolving sedimentation rate, a value of 1 should be provided (which will work as a multiplicator) whereas the actual value of the sedimentation rate will be specified as a magnitude within the assigned time curve via Sedimentation_time_curve or Sedimentation_time_curve_name.
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| Sedimentation_time_curve Time curve number associated with the sedimentation rate |
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Assigns the time curve (by number) which defines the sedimentation rate. The sedimentation rate is scaled by the assigned time curve. In order to define a non-constant sedimentation rate, it is recommended to define the sedimentation rate in the magnitude row (time factor) of the assigned time curve and specify a value of 1 in sSdimentation_rate. If Sedimentation_time_curve is not specified then a constant sedimentation rate is assumed.
Notes •It is possible to simulate erosion by defining negative values as a magnitude in the assigned time curve.
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| Sedimentation_time_curve_name Sedimentation time curve name |
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Assigns the time curve (by name) which defines the sedimentation rate. The sedimentation rate is scaled by the assigned time curve. In order to define a non-constant sedimentation rate, it is recommended to define the sedimentation rate in the magnitude row (time factor) of the assigned time curve and specify a value of 1 in Sedimentation_rate. If Sedimentation_time_curve is not specified then a constant sedimentation rate is assumed.
Notes •It is possible to simulate erosion by defining negative values as a magnitude in the assigned time curve.
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| Surface_temperature Surface temperature |
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Description |
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Defines the surface temperature (at depth 0) that will be used in conjunction with the Thermal_gradient to calculate the temperature boundary condition.
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| Thermal_gradient Temperature gradient with depth |
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Defines the temperature gradient with depth that will be used in conjunction with Surface_temperature to calculate the temperature boundary condition.
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| Surface_load_assignment Load case where the surface load is defined |
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Surface_load_assignment is used to assign the load case (defined via Global_loads) where the surface load is defined. Both the prescribed surface stress ( Surface_load) and the prescribed temperature ( Prescribed_temperature) defined in Global_loads should be set to 1 as they will be scaled by the stress path algorithm computed values.
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